You know what I didn't even read any of the comments, just what the OP wrote, let me tell ya sweety. Being tall is not a bad thing, I know you feel down right now, but look at this way, this girl is paying this much attention to you because she is jealous, and because she doesn't know how to deal with it she is portraying it in a very demeaning and hurtful manner. It obvious there is something about you she wishes she had, it doesn't matter what size or shape you are, women are beautiful, you are beautiful, yes its true I do not know you, but ugliness comes from within, or the mean things someone does, so this girl you might think she is pretty on the outside, but in reality she is just ugly all around, her attitude and disposition towards others speaks volumes. If you allow her to make you feel in this manner she will continue relentlessly, ignore her comments and remind yourself every time she is mean that you are indeed beautiful and valuable. when she realizes you are done even listening to what she has to say she will eventually move on to another target she can easily bully.
if all of this doesn't work for you, just remember that 99/100 supermodels are tall. and most of them dealt with girls that made fun of them for their height, and look at them now. Cheer up love, and don't listen to a word she has to say